'use strict';
//简单文件服务器
var fs = require('fs'),
    url = require('url'),
    path = require('path'),
    http = require('http');
 
 //从命令行参数获取root目录，默认是当前目录
 var root = path.resolve(process.argv[2] || ',');
console.log('Statci root dir:'+root);

//创建服务器
var server = http.createServer(function(request,response){
	//获得URL的path
	var pathname = url.parse(request.url).pathname;
	//获得对应的本地文件路径
	var filepath = path.join(root+'./',pathname);
	//获取文件状态
	fs.stat(filepath,function(err,stats){
		if(!err && stats.isFile){
			//没有出错并且文件存在
			console.log('200'+request.url);
			response.writeHead(200);
			fs.createReadStream(filepath).pipe(response);
		}else{
			//出错了或者文件不存在
			console.log('404'+request.url);
			//发送404响应
			response.end('404 Not Found');
		}
	});
});

server.listen(8080);
console.log('Server is running at http://127.0.0.1:8080/');
